In available technology, there is no valve with controlled opening based on the density of liquid to maintain unchanged liquid density.

现有技术中的阀门不能根据液体的密度变化控制阀的开启状况，从而保持液体的密度不变。

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The first-principle calculation, which is based on the Density Functional Theory, is playing important role in computational materials.

而基于密度泛函理论的第一性原理计算方法，则是计算材料科学的重要基础和核心技术。

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These major elements can be divided into 3 parts as activity, sub-activity and non-activity based on the density of migration in and out.

不同的元素在这一过程中具有不同的地球化学行为，按照其迁入迁出的强度，这些元素可以划分为活动组分、次活动组分和惰性组分3类。

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Scots ministers said a new formula for allocating funding was based on population density, meaning areas like the Highlands would be particularly badly hit.

BBC: Scotland politics

Simplified, higher density and more reliable servers make the hyperscale all-flash datacenter more efficient than datacenters based on solid state disk and hard disk systems.

ENGADGET: Fusion-io brings Fusion ioScale SSD to small, speedy server clusters

Its delivery method is based on a well-characterized, FDA approved biodegradable chemical platform called PLGA. The company's nanoparticles incorporate a high density of attachment sites on their surface, enabling them to carry out multiple functions--like targeting tumors, enhancing diagnostic images, treating diseased tissue or concealing the whole package from the body's natural defenses.

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